They can call it what they like in Australia - the laws are different.

Did you know in the USA they call a boot a trunk? D3 K300NJH- still going strong
D3 K400NJH- gone to car heaven
FL1 - gone to Romania
D3 HD05- gone to a divorce diet
D1 V8 manual - gone but not forgotten
RR Classic - gone but not not forgotten
Too scared of listing the other marques for fear of ridicule

Quality material choice will negate the need for a coating, which may end up cheaper than using powder coated rust. Any steel should be galvanized in my opinion, as that is the only real way of
preventing corrosion. You could also consider using aluminium for low stress parts.
Good luck, and I would be after a rear wheel carrier and sill/ rock sliders to start with.